Abstract
Manganese dissolution from metal-oxide cathodes, and subsequent deposition at graphitic anodes, are considered to be key causes of capacity fade in lithium-ion batteries. The Mn2+ redox state is thought to be the major solvated Mn species, but its coordination environment is not well understood. Herein, we present the effects of Mn2+-containing electrolytes (Mn(PF6)2 and Mn(TFSI)2) on the performance of lithium-iron-phosphate//graphite (LFP//Gr) cells. Clear differences in first-cycle capacities and subsequent cycling efficiencies depending on the associated counter-ion indicate that the Mn coordination environment has a profound effect on the associated electrochemical degradation mechanisms.
| Original language | English |
|---|---|
| Pages (from-to) | A2264-A2266 |
| Journal | Journal of the Electrochemical Society |
| Volume | 166 |
| Issue number | 10 |
| DOIs | |
| State | Published - 2019 |
Funding
Support from the Vehicle Technologies Office (VTO), Hybrid Electric Systems Program, David Howell (Manager), Battery R&D, Peter Faguy (Technology Manager), at the U. S. Department of Energy, Office of Energy Efficiency and Renewable Energy, is gratefully acknowledged. Electrodes herein were fabricated at Argonne’s Cell Analysis, Modeling, and Prototyping (CAMP) Facility. The authors thank D. Graczyk and Y. Tsai for ICP-MS analysis of samples. XANES studies were performed at Sector 20, which is supported by the US Department of Energy and the Canadian Light Source. The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. Support from the Vehicle Technologies Office (VTO), Hybrid Electric Systems Program, David Howell (Manager), Battery R&D, Peter Faguy (Technology Manager), at the U. S. Department of Energy, Office of Energy Efficiency and Renewable Energy, is gratefully acknowledged. Electrodes herein were fabricated at Argonne?s Cell Analysis, Modeling, and Prototyping (CAMP) Facility. The authors thank D. Graczyk and Y. Tsai for ICP-MS analysis of samples. XANES studies were performed at Sector 20, which is supported by the US Department of Energy and the Canadian Light Source. The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (?Argonne?). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02- 06CH11357.